Does genetic diversity reduce sibling competition?

Aguirre, J. David and Marshall, Dustin J. (2012) Does genetic diversity reduce sibling competition?. Evolution, 66 1: 94-102. doi:10.1111/j.1558-5646.2011.01413.x


Author Aguirre, J. David
Marshall, Dustin J.
Title Does genetic diversity reduce sibling competition?
Journal name Evolution   Check publisher's open access policy
ISSN 0014-3820
1558-5646
Publication date 2012-01
Year available 2011
Sub-type Article (original research)
DOI 10.1111/j.1558-5646.2011.01413.x
Volume 66
Issue 1
Start page 94
End page 102
Total pages 9
Place of publication Oxford, United Kingdom
Publisher Wiley-Blackwell Publishing
Collection year 2012
Language eng
Abstract An enduring hypothesis for the proximal benefits of sex is that recombination increases the genetic variation among offspring and that this genetic variation increases offspring performance. A corollary of this hypothesis is that mothers that mate multiply increase genetic variation within a clutch and gain benefits due to genetic diversity alone. Many studies have demonstrated that multiple mating can increase offspring performance, but most attribute this increase to sexual selection and the role of genetic diversity has received less attention. Here, we used a breeding design to generate populations of full-siblings, half-siblings, and unrelated individuals of the solitary ascidianCiona intestinalis. Importantly, we preclude the potentially confounding influences of maternal effects and sexual selection. We found that individuals in populations with greater genetic diversity had greater performance (metamorphic success, postmetamorphic survival, and postmetamorphic size) than individuals in populations with lower genetic diversity. Furthermore, we show that by mating with multiple males and thereby increasing genetic variation within a single clutch of offspring, females gain indirect fitness benefits in the absence of mate-choice. Our results show that when siblings are likely to interact, genetic variation among individuals can decrease competition for resources and generate substantial fitness benefits within a single generation.
Keyword Indirect benefits
Multiple-mating
Resource partitioning
Sexual reproduction
Sibling competition
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article first published online: 13 August 2011.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Biological Sciences Publications
 
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